Driving mechanism for pulp-screens.



L.- F. PALES.

- DRIVING MECHANISM FOR PULP SCREENS.

APPLIOATION FILED JAN. 18, 1912.

1,026,948. I PaItentedMay21, 19 12.

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COLUMBIA PLANouRAPrj CO.,WASHINGTON. D. c.

L. F. FALES.

DRIVING MECHANISM FOR PULP SOREENS. APPLICATION FILED JAN. 18, 1912.

1,026,;948. Patented May 21, 1912.

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COLUMBIA PLANOGRAPH CO.,WASHINGTDN. u.

. UNITE LEWIS r. FALES, or WALPOLE, MASSACHUSETTS.

DRIVING MECHANISM FOR PULP-SCREENS.

To all whom it may concern:

Be it known that I, Lnwrs F. FALES, of Walpole, in the county of Norfolkand State of llIassachusetts, have invented certain new and usefulImprovements in Driving Mechanisms for Pulp-Screens, of which thefollowing is a specification, reference being had to the accompanyingdrawings, forming part thereof.

This invention has reference to improvements in mechanism for drivingthe rotary screens of pulp screening or straining machines.

One object of the invention is to so construct a driving mechanism forrotary pulp screens that the main shaft thereof may be comparativelyshort and that said main shaft and the mechanism operated thereby todrive the pulp screens may be strong and efficient while of simpleconstruction.

Another object of the invention is to so construct a driving mechanismfor rotary pulp screens having a vibratory movement that the axis onwhich said screens vibrate shall be approximately coincident with thepitch point of the driving and driven gears whereby the teeth of thedriven gears of the pulp screens may, in their vibratory movement, rockon the drive gear.

Another object of the invention is to simplify the construction ofdriving mechanisms for rotary cylindrical pulp screens.

Other objects of the invention will appear from the followingdescription.

The invention consists in the novel driving mechanism for pulp screensas shall hereinafter be more fully described and pointed out in theclaims.

Figure 1, represents an end View of a duplex rotary pulp screen providedwith my improved driving mechanism. Fig. 2, represents a side elevationof portions of the same.

Similar numerals of reference designate corresponding parts throughout.

This invention has reference to improvements in driving mechanisms forpulp screens of the nature described in U. S. Letters Patent No.955,025, granted to Otto lVandel, April 12, 1910.

In rotary pulp screens of the nature herein referred to it is desirablethat, in operation, the cylindrical screens be rotated continuously andthat during such rotation the screens be sharply and intermittentlyvibrated to efiect the sifting of the finer par- Specification ofLetters Patent.

Application filed. January 18, 1912.

Patented May 21, 1912.

Serial No. 671,943.

ticles of pulp through the interstices of the screens. In view of suchconstant vibration of the mechanism it is desirable that the drive gearShould be of such relation that its parts shall not be unduly worn andit is also desirable that the drive gear should be supported close tothe main frame. It is also important that the drive gear should be ofsuch nature that the meshing teeth thereof may be accurately formed inan economical manner.

As shown in the drawings 5 indicates one of the main end frames havingat its upper portion the studs or pivots 6, 6 on which are pivoted thevibrator frames 7, 7 having at their upper portions hearings in whichthe tubular collars 8, 8 of the cylindrical screens 9, 9 are j ournaledand said frames 7, 7 having the depending arms 10, 1O furnished neartheir lower ends with the slide blocks 11, 11 having the projections 12,12 and secured in position on said arms 10, 10 by the bolts 13, 18.Secured to the lower portions of said vibrator frames 7, 7 are laterallyextending bolts 141-, 1 1 which are Slidable in perforations of theguide blocks 15, 15 secured to the frame 5 and Said bolts are furnishedat their outer end portions with elastic buffers 16, 16 held fromoutward movement by the adjusting nuts 17, 17 whereby the returnmovement of the frames 7, 7 is limited through the interception of thebuffers 16, 16 by the guide blocks 15, 15.

Securely mounted on the main frame 5 is the drive frame having themembers 18 and 19. In bearings respectively of the main frame and saiddrive frame is journaled the main shaft 21 having the drive pulley 22the miter pinion 23 and the throw cam 24:, this latter being locatedbetween and acting on the projections 12, 12 of the blocks 11, 11 toeffect, during the rotation of the main shaft, the rapid vibration ofthe arms 10, 10 and their frames 7, 7.

J ournaled in the vertical bearing 25 of the drive frame member 19 isthe worm shaft 26 having at its lower end the miter pinion 27 driven bythe similar pinion 23 of the main shaft 21, and at its upper end theworm 28 meshing with the worm gears 29, 29 mounted on the respectivecollars 8, 8 of the screens 9, 9. The pitch of the worm 28 and of thegears 29, 29 are so related that the pitch points thereof, at which theWorm 28 is fully engaged between two teeth of each gear 29, 29 areapproximately coincident with the axes of the studs or pivots 6, 6 sothat, as the frames 7 7 swing on said pivots the teeth of the gears 29,29 may rock relatively to the thread of the worm 28 without undue wearof either of said parts.

By the use of the vertical worm 28 I find that the length of the mainshaft 21 can be shortened as shown in Fig. 2 of the drawing and that theouter bearing for said main shaft, formed between the members 18, 19 canbe brought closer to the main frame than as heretofore constructed,hence the vibration of such bearing is considerably reduced. I find alsothat the Worm gears 29, 29 may be more economically and more accuratelycut or formed than is the case with crown gears or spur gears.

Having thus described my invention I claim as new and desire to secureby Letters Patent 1. Driving mechanism for rotary pulp screenscomprising a main frame, a drive gear frame secured to the main frameand having a horizontal bearing and a vertical bearing, a main shaftjournaled in the horizontal bearing and having a miter p1n1on,

a power transmission shaft journaled .in

said vertical bearing and having a miter pinion meshing with the pinionof the main shaft, a cylindrical pulp screen rotatably mounted inbearings, and driving connec tions between said power transmission shaftand said pulp screen, substantially as described.

2. Driving mechanism for rotary pulp screenscomprising a main framehaving a pair of studs, frames pivotally mounted on said studs, meansfor vibrating said frames, a pair of cylindrical pulp screens rotatablymounted in said frames and having worm gears, a worm-located betweensaid worm gears and in engagement therewith, and means for driving saidworm.

V 8. Driving mechanism for rotary pulp screens comprising a main frame,a pair of vibratory frames carried on members of the main frame, a pairof pulp screens jour- ,journaled in said vibrator frames and hav mg wormgears, a shaft Ournaled in a ver- .t1cal bearing ofv sa1d drlvegear'frame and having a worm located between said worm gears and inengagement with both thereof, a miter pinion at the lower end of saidworm shaft, and a main shaft journaled in bearingsrespectively of saidmain frame and drive gear frame, said main shafthaving, a throw camacting on the cam blocks of the vibrator frames and a miter pinion inengagement with, the similar pinion of the worm shaft, substantially asdescribed. LEWIS F. FALES. WVitnesses:

WILLIAM H. CLARKE, W. O. VROCKWOOD.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Eatents. Washington, D. 0.

